Add muscleType detail to testCMCGait10dof18musc failure message.
Add muscleType detail to testCMCGait10dof18musc failure message.

opensim-org/opensim-core,opensim-org/opensim-core,opensim-org/opensim-core,opensim-org/opensim-core,opensim-org/opensim-core,opensim-org/opensim-core,opensim-org/opensim-core